# A012323 (b-file synthesized from sequence entry)
0 0
1 1
2 2
3 2
4 -16
5 -160
6 -880
7 -824
8 51648
9 800960
10 6435328
11 -2043776
12 -1126578176
13 -22272551808
14 -223518587136
15 765475969792
16 87232814768128
17 2039252913397760
18 22937720650260480
19 -211391911253512192